Trimming device for sewing machines



May 3, 1932. K. MAIER TRIMMING DEVICE FOR SEWING MA CHINES Filed Dec. 20, 1929 the lower I said movable trimming blade is provided with meted May 3, 193 2 iaszosa' UNITED STAT S PATENT. oar-"Ice mr. mums, orisrnrrennr, GERMANY, nssz'enonro mnoiv srnom H I'AZBBIK, G. B. '3 OF STUTTGART, e DEVICE TOR snwme-monmns V Application filed ZlJecember 20, 1929, Serial No} 415,477, and in Germanyhprfl 25,;1929} The invention relates to new and useful improvements in a trimming device for sewing machines, and morep'articularly to a trimming device for severingone layer. only, of two fabric sections close'to the line of stitching as the fabric sections are stitched.

An object of the. invention is to provide a trimming device of the above character" wherein the movable blade is mounted be-;

neath the throat plate and is provided with an overhanging cutting portion for trimming fabric section only, and wherein a guard for preventing the cutting into of the overlying fabric 'section'. A v

A further object'of the invention is to provide .a trimming device of. the above-character wherein a stationary blade cooperates with the movable blade blade forms one wall of the needle opening so that the lower fabric section may be trimmed or out very close to the line of stitchin vfurther object of the invention is to provide a trimming device of the above character wherein a guide plate is provided extending alongside of the stationary blade and the supporting loop portion of the movable blade for guiding and supporting said blades and also. for preventing the trimmed of'f portion of the material from passing beneath the throat plate. 4

In the drawings Figure 1 is a view showing a fabric with a portion thereof cut and stitched, and also showing an edging or point-trimming which is secured by the lineof stitching, the edging being shown detached in order to show the position of the line of stitching and cutting in themain fabrici section. I

Fig. 2 is a view showing the main fabric section and the edging or point trimming assembled and ready to be presented to the combined stitching and trimming mechanism.

Fig. 3 is a view showing the edging attached to the main fabric section and the portion of the main fabric section beneath the 'ng-cut away. ig. 4 is aplan view of a portion of a machine embodying the improvements.

andsai-d stationary.

' The blade sectioned in order to show the. structure Y of theguide platebeneath' the overhanging part of the movable blade.

Fig.6 is a side View ofthe parts shown in. F'g. 4, the needle being up and the looper forward and in section.

Fig. 7 isa. view similar to' FigQB, omitting the needle and showing the-movable trimming blade as shifted to an inoperative position.

a Fig. 8' is a plan, viewiofthe stationary trimming blade.

The invention is directed to a sewing machine for stitching-and trimming'fabric sections. The machine is particularly designed for the sewing of an edging or point trimming to a main fabric section and the cutting away ofthe mainfabric section beneath the edging or trimming along a line parallel with the stitching. the main fabric section is shown ate; the edging or point trimming at'a. The edging has inclined portions 6 forming-the points. purposeof the machine is to stitch an edging or point trimming of this character. to a fabric by a line of stitching which passes along and is parallel with the inclined edge portions '6. The machine'also trims the fabric section along a line forming inclined por-' tions '7' as shown in Fig. 1,;andthus cuts away a strip e leaving the main fabric section 'with the inclined portions 7 corresponding to the" inclined portions 5.

The line of stitching is indicated at d. This line of stitching is parallel with the line on which the fabric sectione'is cut and is also parallel with the inclined portions 6 forming the point of the trimming or edging a.

The sewing machine includes a needlem and a looper s which cooperates therewith in the forming of a line of stitching. Only a portion of the sewing machine is shown. The throat plate 0 is provided with a' needle opening Z through-which the needle 'm reciprocates. Mounted on. the throat. plate "is a stationary cutting blade g- This cutting blade 9 has a cut away portion k formin anarrow blade h. The face i is the cutting face of the blade. The needle opening I is closed by the blade 9, and there- In l ig's'. l to 30f thedrawings hanging portionq j the edging or trimming I 0 the main fabric section. There 1s also a Mounted beneath, he throat plate 0 is a movable cutting blade .7. This movable cutting blade 1 is mounted on a. suitable supporting means which has anup and down movement-for imparting vibrations to the movable cutting blade. The means for moving this cutting blade may be of any desired character. The cutting blade 1-. has an upwardly projecting loop portion t and an overwhich overhangs the-plane of the throat plate 0 during the normal cutting operation of .the movable blade. 1 The point of the movable blade is. so disposed as to lie in between the main fabric section and which is stitched to guard 4) attached to the movable blade which extends forward of the cutting point and which is provided with a raised portion in rear of the cutting point. This guard is for a ing or trimming able trimming blade for the purpose of directing the edging or trimming, and aids in the separating-of the edgfrom the main fabricsection so that the point of the movable cutting blade will be shielded and prevented from penetrating the edging or trimming, while at the same time the movable trimming blade willcut the lower fabric section.

Alongside of the movable cutting blade 1 is a support or guide plate :11. This support or guide plate a; is attached to the cloth plate by a suitable screw w. Said support or guide plate has a forwardly projecting portion y which engages the movable trimming blade.

and aids in the su porting of the movable trimming blade in rm'shearing contact with the stationaryblade. The guide plate a: is cut away at ,2 directly in front of the mova short distance and this provides a space in which the movable blade can operate. This support or guide plate at directs the trimmed ofi' portion of the main fabric section up onto the throat plate 0 and over the top of the throat plate, thus preventing the trimmed off section from be-' ing deflected beneath the throat plate and interfering with the action of the feed or looper.

The forward edge of the throat plate is beveled in order to aid in the directing of the trimmed oif strip up onto the throat late. The support or guide plate w extends a ongside of the stationary trimming blade g and aids in the supporting of this blade.

The operation of the device is thought to be apparent from the above description?" The ed ng or point trimming to be attached to aabric section is placed on the fabric sec- At the same time the trimming the wallof the needle tion as shown in Fig. 2. The parts thus assembled are fed to the needle so that the needle will stitch along one of the inclined edge portions 12 of the edging or point trimming and thus secure the same to the fabric section. blade operat ing directly in rear of the point of stitching will cut the lower section only along a line parallel with the line of stitching. When the inner point of the edging is reached, then the direction of feed is changed so that the stitching passes along the next adjacent inclined ortion 6 next to the edge thereof. The line of trimming also changes its course and follows the line of stitching in the main fabric H the main fabric section Thus it is that section, again cutting close to the line of stitching. the edging or trimming is attached to the main fabric section and the fabricsection beneath the edging or point trimming is out away closeto the line of stitching.

Having fully described my invention what I claim as new and desire to secure by Let'- ters Patent is:-

1. A trimming device for sewing machines including a throat plate, a stationary trimming blade carried by said throat plate and located at one side of the needle and forming the wall of the needle opening between the needle and the movable trimming blade, a movable trimming blade mounted beneath the throat plate and projecting above and overhanging the throat plate and cooperating with said stationary blade in the trimming of the lower layer only of'twofabric sections being stitched.

' 2. A trimming devicefor sewing, machines including a throat late, ming blade-carried y said throat plate and .located at one side of the needle, a movable blade mounted beneath the throat projecting above and overhanging trimmin plate an the throat plate and cooperating with'said stationary blade in the trimming of the lower layer only of two fabric sections being stitched, a guard carried by and projecting in front of the overhanging portion of the movabletrimming blade adapted to pass between fabric sections being stitched.

3. A trimming device for sewing machines including a throat plate, a stationary trimming blade carriedby said throat (plate and located at oneside of the needle an forming opening between the needle and the movable trimming blade, a movable trimming blade mounted beneath the throat plate and projectin overhanging the throat plate, an cooperating with said stationary blade in the trimming gfthe lower layer only of two fabric sections eing stitched; and a support or guide plate located beneath theoverhanglng portion of said movable trimming blade for directing the trimmed ofi edge portion onto and'over the throat plate of the sewing machine.

a stationary trimabove and and overhanging the throat plate and co- 2i 5 throat plate.

operating with said stationary blade in the trimming-'of the lower layer only of twofabric sections being stitched..

5. A trimming device for sewing machines including a throat plate havin a needle: opening, a stationary trimming b ade carried by the throat plateand havinga reduced ortion adjacent the trimming face of said b ade formingone wall of the needle 0 ning, a movable trimming blade moun beneath the throat plate and projecting above and overhanging the throat plate andcooperating withsaid stationary. blade in the trimming of the lower la er only of two fabric sections being stitched, and a guard carried by and projectingin front of the overhan g. portion of the movable trimming b ade; adapted to pass between the fabric sections-f '6. A trimming device for sewing machines; including a throat plate ha a' needle opening, a stationary trimming b ade by the throat plate and having. a reduced r-, tionadjacent the trimming face of said b e forming one wall 'of the needle i a movable trimming bladammm -v beneath the throat plate and proi'ectingabove and, overhanging the throat p ate and cooperatingw-ith said stationary blade in the trim-- mingof the lower layer only of two. fabric sections being stitched, a guard ab-tried by; the overhangmg rtion' of the: movable. trimming blade a apted to pass between the a fabric sections, and a su port and guide late carried by the-throat piiite and i w: b neath the overhan portion of fie mov able trimming bla e',.sa1dsupport engaging ghe stationary blllade and tidie movable b agile or suppor ingt esamqan operating to rect the trimmed ofi strip onto and over the "In testimony whereof, I. atiix my 1 

